Sardar and the lie detector

An Englishman, an American and a Sardarji are called upon
to test
a lie detector. The Englishman says: "I think I can empty 20
bottles of beer".
BUZZZZZZ, goes the lie detector.
"Ok", he says, "10 bottles".
And the machine is silent.
The American says: "I think I can eat 15 hamburgers". BUZZZZZZ,
goes the lie detector.
"Allright, 8 hamburgers".
And the machine's silent.
The Sardarji says: "I think...",
BUZZZZZZ goes the machine.